Light-scattering substrate, method for manufacturing light-scattering substrate, polarizing plate and image display device
a technology of light-scattering substrates and polarizing plates, which is applied in the direction of polarizing elements, instruments, other domestic objects, etc., can solve the problems of deterioration of display screen uniformity, increased light transmittance, and lowering of front white brightness, so as to suppress interference-induced stripes, improve display performance, and reduce costs
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example 1
Preparation of Light-Scattering Substrate
[0233]Each of dopes was prepared in a solid composition for dope shown in the following Table 1; a base layer dope and a surface layer dope were simultaneously cast so as to have a constitution regarding a film thickness after drying as shown in the following Table 2, thereby preparing light-scattering substrates 1 to 23. With respect to the light-scattering substrates 1 to 21, the dope for the surface layer 1 was cast using a casting apparatus shown in FIG. 3 such that it was located on the side of a mirror-finished drum cooled at −10° C. and cooled for gelation while evaporating the solvent; and a web was then stripped off. The web was dried by hot air at 100° C. until the residual solvent amount reached 10% by mass and then dried by hot air at 140° C. for 10 minutes. With respect to the light-scattering substrates 22 and 23, the dope for the surface layer 1 was cast on a mirror-finished band at 18° C. using a casting apparatus shown in FIG...
example 2
[0275]A dope having a composition shown in the following Table 4 was prepared; and a light-scattering substrate 24 was prepared in the same manner as in the light-scattering substrate 23, except for using a dope P-1 in place of the dope A (surface layer 1), a dope P-2 in place of the dope B (base layer), a dope P-3 in place of the dope K (surface layer 2) and a dope P-1 in place of the dope B (surface layer 3), respectively in the light-scattering substrate 23. The light-scattering substrate 24 had a refractive index of 1.48. A viscosity of the surface layer dope P-1 disposed on the side of the superficial surface (side-A) on the air side of the light-scattering substrate at room temperature (25° C.) was 26 Pa·s.
example 3
[0276]A dope having a composition shown in the following Table 4 was prepared; and a light-scattering substrate 25 was prepared in the same manner as in the light-scattering substrate 23, except for using a dope Q-3 in place of the dope A (surface layer 1), a dope Q-1 in place of the dope B (base layer), a dope Q-2 in place of the dope K (surface layer 2) and a dope Q-3 in place of the dope B (surface layer 3), respectively in the light-scattering substrate 23. The used materials are shown below. The light-scattering substrate 25 had a refractive index of 1.58. In Table 4, the polycarbonate is a polycarbonate resin having a mass average molecular weight of 45,000. A viscosity of the surface layer dope Q-3 disposed on the side of the superficial surface (side-A) on the air side of the light-scattering substrate at room temperature (25° C.) was 22 Pa·s.
[0277]Also, the following material was used.
[0278]SBX-8: Crosslinked polystyrene spherical particle, mean particle size: 8 μm, manufac...
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